Datasheet

Direct Page Registers
MC68HC908QB8 Data Sheet, Rev. 3
Freescale Semiconductor 25
Addr.Register Name Bit 7654321Bit 0
$0000
Port A Data Register
(PTA)
See page 104.
Read:
R
AWUL
PTA5 PTA4 PTA3
PTA2
PTA1 PTA0
Write:
Reset: Unaffected by reset
$0001
Port B Data Register
(PTB)
See page 106.
Read:
PTB7 PTB6 PTB5 PTB4 PTB3 PTB2 PTB1 PTB0
Write:
Reset: Unaffected by reset
$0002
↓
$0003
Reserved
$0004
Data Direction Register A
(DDRA)
See page 104.
Read:
R R DDRA5 DDRA4 DDRA3
0
DDRA1 DDRA0
Write:
Reset:00000000
$0005
Data Direction Register B
(DDRB)
See page 107.
Read:
DDRB7 DDRB6 DDRB5 DDRB4 DDRB3 DDRB2 DDRB1 DDRB0
Write:
Reset:00000000
$0006
↓
$000A
Reserved
$000B
Port A Input Pullup Enable
Register (PTAPUE)
See page 105.
Read:
OSC2EN
0
PTAPUE5 PTAPUE4 PTAPUE3 PTAPUE2 PTAPUE1 PTAPUE0
Write:
Reset:00000000
$000C
Port B Input Pullup Enable
Register (PTBPUE)
See page 108.
Read:
PTBPUE7 PTBPUE6 PTBPUE5 PTBPUE4 PTBPUE3 PTBPUE2 PTBPUE1 PTBPUE0
Write:
Reset:00000000
$000D
SPI Control Register
(SPCR)
See page 171.
Read:
SPRIE R SPMSTR CPOL CPHA SPWOM SPE SPTIE
Write:
Reset:00101000
$000E
SPI Status and Control
Register (SPSCR)
See page 172.
Read: SPRF
ERRIE
OVRF MODF SPTE
MODFEN SPR1 SPR0
Write:
Reset:00001000
$000F
SPI Data Register
(SPDR)
See page 174.
Read:R7R6R5R4R3R2R1R0
Write: T7 T6 T5 T4 T3 T2 T1 T0
Reset: Unaffected by reset
$0010
ESCI Control Register 1
(SCC1)
See page 122.
Read:
LOOPS ENSCI TXINV M WAKE ILTY PEN PTY
Write:
Reset:00000000
$0011
ESCI Control Register 2
(SCC2)
See page 124.
Read:
SCTIE TCIE SCRIE ILIE TE RE RWU SBK
Write:
Reset:00000000
$0012
ESCI Control Register 3
(SCC3)
See page 125.
Read: R8
T8 R R ORIE NEIE FEIE PEIE
Write:
Reset:U0000000
$0013
ESCI Status Register 1
(SCS1)
See page 126.
Read: SCTE TC SCRF IDLE OR NF FE PE
Write:
Reset:11000000
= Unimplemented R = Reserved U = Unaffected
Figure 2-2. Control, Status, and Data Registers (Sheet 1 of 5)